Rotary magnetic head tape-scanning device with heads protected from cross-talk by mounting on a head carrier and by annular shielding of a portion of the head projecting from the head carrier
US5075809A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1989 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | May 23, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/112
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic head affixed to the underside of a carrier body mounted at the periphery of a head-wheel for scanning oblique tracks on a magnetic tape is provided with shielding of ferrite, mu-metal or amorphous iron, to reduce magnetic crosstalk. The shielding surrounds the part of the magnetic head that projects beyond the head carrier body except for a small portion near the polished surface that needs to be left uncovered to avoid interfering aerodynamically with the contact of the magnetic head with a magnetic tape. One piece of the shielding is of rectilinear shallow U-shaped profile, forming a pocket for the magnetic head below the carrier body and extends beyond the tip of the carrier body, where the second piece of shielding material completes an annular shielding ring around the end of the magnetic head. This shielding is particularly useful for an after-check playback head used during recording to check on the quality of the recorded signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.